radgrad/radgrad2

#!/bin/bash

# Run from your project's root
# Run "npm install" or "npm update" before
# Requirement: ~/Desktop/jq-osx-amd64 (https://stedolan.github.io/~/Desktop/jq-osx-amd64/)

required () {
    grep -R "from ['\"]${1}[\\/'\"]\|require(['\"]${1}[\\/'\"]" --exclude-dir=node_modules --include='*.js' > /dev/null
}

used_in_script () {
    # Use a temp file as "while … done" executes in a subprocess and any return or
    # local variable in there won't be passed to function's scope
    local tmp=$(mktemp)
    echo 1 > $tmp
    if ~/Desktop/jq-osx-amd64 -e 'has("scripts")' package.json > /dev/null; then
        # There are npm scripts, look into them (note: here we won't recursively parse referenced scripts)
        if ~/Desktop/jq-osx-amd64 -e 'has("bin")' "node_modules/$1/package.json" > /dev/null; then
            # dep has bins, check for them
            ~/Desktop/jq-osx-amd64 -r '.bin|keys|join("\n")' "node_modules/$1/package.json" | while read b; do
                if ~/Desktop/jq-osx-amd64 -r '.scripts|values|join("\n")' package.json | grep "\(^\|['\" ]\)$b\($\|['\" ]\)" > /dev/null; then
                    echo 0 > $tmp
                fi
            done
        fi
        # All cases: check for direct reference (used as a plugin)
        if ~/Desktop/jq-osx-amd64 -r '.scripts|values|join("\n")' package.json | grep "\(['\" =]\)${1}\($\|['\" ]\)" > /dev/null; then
            echo 0 > $tmp
        fi
    fi
    local status=$(cat $tmp)
    rm -f $tmp
    return $status
}

check_used () {
    local tmp=$(mktemp)
    echo 0 > $tmp
    ~/Desktop/jq-osx-amd64 -r ".${1}|keys|join(\"\\n\")" package.json | while read p; do
        echo -e -n "\033[0m$p… "
        if required $p; then
            echo -e "\033[1K\033[0;32m\r$p used (required)."
        elif used_in_script $p; then
            echo -e "\033[1K\033[0;32m\r$p used (npm script)."
        else
            echo -e "\033[1K\033[1;31m\r$p unused?"
            echo 1 > $tmp
        fi
    done
    local status=$(cat $tmp)
    rm -f $tmp
    return $status
}

check_used_all () {
    local res=0

    echo -e "\033[;1m\nChecking dependencies…\n"
    if check_used "dependencies"; then
        echo -e "\033[1;32m\nEverything looks OK :)"
    else
        res=1
        echo -e "\033[1;31m\nSome packages looks like not being used (but I may have not detected them)"
        echo -e "\033[0mTo remove a package: npm remove --save <package>"
    fi

    echo -e "\033[;1m\nChecking devDependencies…\n"
    if check_used "devDependencies"; then
        echo -e "\033[1;32m\nEverything looks OK :)"
    else
        res=1
        echo -e "\033[1;31m\nSome packages looks like not being used (but I may have not detected them)"
        echo -e "\033[0mTo remove a package: npm remove --save-dev <package>"
    fi

    return $res
}

if check_used_all; then
    echo -e "\033[1;32m\nALL OK."
    exit 0
else
    echo -e "\033[1;31m\nCheck your dependencies…"
    exit 1
fi